Davit for lifeboats



Nov. 13, 1928.

A. W. LYDA DAVIT FOR LIFEBOATS 6 Sheets-Sheet 1 W y m L M 1 x @w r Q X 1 m w w \m 3 N w RNQ k Filed Oct. 12, 1926 Nov. 13, 1928. 1,691,245

A. W. LYDA DAVIT FOR LIFEBOATS 6 Sheets-Sheet 2 Filed Oct. 12, 1926 gwumkoc A. WLyda Nov. 13, 1928. r 1,591,245

A. W. LYDA DAVIT FOR LIFEBOATS v Filed Oct. 12; 1926 Q SheEis-Sheet 3 Nov. 13,192&,

A. vy. LYDA DAVIT FOR LIFEBOATS i led Oct. 12, 1926 6 Sheets-Sheet 5 DAVIT FOR LIFEBOATS Filed Oct. 12, 1926 6 Sheets-sheaf 6 Patented Nov.

uurrsn STATES PATENT OFFICELI ARTHUR W. Lyn-A, OF NORTH cAuTomoHIo, AssIeivon To THE AMERICAN SAFETY NAVIGATION COMEPANI, or CANTON? onro, A. conronarrou or 01x10.

DAVIT non LIrE oATs.

Application filed Butcher 12, 1926. Serial No. 141,068.

The invention relates to davits for carrying, raising, and lowering ll'ie boats; and the object of the invention is to provide davits a drum being located in a suitable position adjacent to the davits, preferably beneath the deck, and having a cable wound around the same and extended over pulleys upon each support and boom member and connected to each end of the lite boat, suitable motor operating mechanism being provided for revolv ing; the drum, and. a brake being provided for controlling the operation of the mechanlsm,

to regulate the speed at wh ch the boat is substantially on the line l-4:, .liigs. 5 and 6;

Fig. 5, a vertical section, on the line 5--5, Fig. 4;

iii 6, aside elevation oi the drum and astaken substantially at .sociated mechanism, ri ht angles to in: 4L; I

'9. 7, VIt1utl sectional view through the drum, on the line 7-7, Fig. 6;

Fig. 8, an enlarged seetioualview tl'irough the brake drum, taken substantially on the line 8 8, Fig. 5;

Fig. 9, an enlarged sectionalview through the brake cable sheave, on the line 9--9, Fin 5; I r

shaft and casing, howi g the friction means for preventing re movement oi the shaft, taken on th lne lO-lO, Fig. 4c, and

Fig}; ll, detail perspective view one of the blades upon the brake governor.

Similar numerals of reference indicate cori 10, a section through the drive worm responding parts throughout the drawings.

A portion of the deck of a ship is shown at 1, the supporting standards 2 being connected thereto in anysuitablemanner and properly spaced apart toaccommodate the life boat indicated generally at 3.

Each oi these supporting standards is preferably curved inward, above the deck and provided at its upper end with a pulley; which may be mounted thereon as by the brackets 5. A r

A base 6 is fixed upon the deck adjacent to each supporting upright andprovided with the inverted V-shaped boom member 7, pivoted at its lower end to the base, as indicated at 8, and suitably braced as shown at 9.

Each boom member is arranged to receive the upper portion of the adjacent support when the life boat is in the normal position as shown inl igs. l and 2. i

A saddle 10 is provided upon each supporting member 2 to receive the trunnion 11, upon the adjacent end of the life boat, and nor-, mally support the same, a pivoted latch 12 being provided for engaging the trunnion and holding the boat in position upon the supports.

The lower portion of each latch is pivotally connected at 13 to a link 14 pivoted to one end of the lever 15, which is pivotally mounted upon the adjacent support as shown An operating rod 1'7 is pivotally connected" at its inner end to each lever 15 and slidably extended backward through a suitable guide bracket 18, which may be mounted'upon the upright cable guiding tube 19. i a

A plate is carried by the upper end por tion of each boom member 7, and provided with apair of spaced curved tracl 21 and 22, the upper track 21 being of considerably greaterlength th the lower track.

A pulley is journaled in the upper end of each boom member, and {the cable 24, which is passed around orconnected to the drum 38, passes upward through the tube 19, over the pulleys and 23, and is provided upon its free end with a hook 26, which preferably is of the quick releasing type shown my Patent No. 1,582,062, of April 27,

i92o, arranged to engage an eye ZI provided upon the adjacent end aortion of the life boat. Any suitable adjusting means 28 may be provided in the cable between the end portion thereof and the hook.

A block 29 is rigidly connected to the cable by any suitable and well known means and arranged to be normally received by the curved tracks 21 and 22, upon the plate 20, when the parts are in the normal-position.

For the purpose of limiting the outward swing of the boom member 7, a chain 80 is connected to a portion of each boom member, and to the upper portion of each adja- 1 cent upright support 2, limiting the outward swinging movement of the boom members to the dotted line position shown in Fig.

The action of the block 29 in the curved tracks and 22 is iilustrated in the diagrammatic drawing shown in 3. Thus the cabie permits the regulation of the outward and inward movementof the boom.

This movement is illustrated in Fig. 3 in which at A the block 29 is shown resting on the surface of the lower curved track 22. By examining the force diagram shown thereon it will be seen that there is a turning moment on the boom equal to W X M. This turning moment throws the boom outward, and again referring to the force diagram it is seen that Z is less than a0 or 111 other words the cable pull is W.

At B the block 29 has slid alongthe surface of the lower curved track 22, as the boom has swung partly outward on its center K. At this point do is equal to Z20, andthe block 29 is as likely to be against the surface 22 as the surface 21.

At G, with the boom at the outward limit of its movement the line 50 has become greater than a0; therefore, the cable tension in this position is greater than the load.

The block 29 at this point is entirely clear of the lower curved track 22, andas soon as the block is lowered out of contact with the upper curved track 21 the force diagram changes to 0d and 0a with a resultant 0c:

This gives a turning'momcnt on the boom r 0 c around the pivot equal to W X a X hi i with the weight ofthe life boat causing the block to slide along the surface 21 and moving; the surface 22 under the block. As soon as the line 06 becomes shorter than the line 0a, the block will leave the surface 22 and slide along to the position shown at A.

A supporting plate 31-is mounted. in any suitable location adjacent to the davits, preferably beneath the deck and has secured thereto the depending, truncated cone 32, provided at its upper, or base, end with the ball race 33. f

A disk 3% is secured to the lower end of the cone as by bolts 35 and provided with the flange 36 having a ball race 37 therei The drum 38 is provided with a ball ace 219 at its upper end, balls 40 cooperating therewith and with the ball race 33 in the base of the cone. 7

The worm wheel 41 is connected to the lower reduced end 42 of the drum, as by the bolts A3, and provided with a ball race 1%, the balls 45 being mounted between said ball race and the race 36 in the disk 3%.

The drum 38 is thus journaled upon the upper and lower ball races to revolve around the cone 82. An annular flange L6 is formed upon the drum 38, midway between the top and bottom thereof, the bevel ring gear 4.? being connected thereto as by the bolts 418.

A ring flange 19 is connected to the shouldered portion 59 of the drum, below the flange A6, as by the screws 51.- A pair of spaced.

ring flanges 52 are rotatably mounted upon the drum beneath the ring 49, being supported as by the clamps connected to the lower portion of the drum by the screws A bracket- 55 depends from the lower ring 52, the worm 56 being journaled therein and meshing wit the worm wheel 4-1. The worm shaft 57 is provided with squared ends 58 to one of which a wrench or othersuitable tool may be applied for adjusting the annular channel rings 52 relative to the drum 38.

The cable 2 1 from one ,davit leads to the drum 88 between the flanges 46 and 49 and the end of the other cable 2% leads to the annular channel 52.

The motor 59 is provided at its upper side with the feet 60, connected, as by the bolts 61., to the wooden blocks 62 mounted upon the under side of the supporting plate 31.

A pinion .63 is mounted upon the shaft 6 1 of the motor and meshes with a gear 65 upon the shaft 66 journaled in the gear case 6? which is supported upon the under side of the plate 31 as by the bolts 68.

A worm 69 is mounted upon the shaft 66 and meshes witha Worm wheel'TO carried by the tubular shaft 71 which is journaled in the gear case 67 and upon the shaft 72.

A clutch member 73 is fixed upon the tubular shaft 71 and arranged to be engaged by the clutch member 7 1 which is slidably keyed upon the shaft 7 2. i

A yoke 7 5 is provided with pins 76 engaging the annular groove 77 in the slidable clutch member 74, one of said pins being connested, as by a link 78,.with one end of the bell crank 79 which is pivoted, as at 80, upon the depending bracket 81, suspended from the undcr side of the supporting plate as by bolts 2 The lower end of the bell crank is'pivotally connected, as at 83,to. a link 81, swivelly connected to the disk 110, upon the shaft 85, iournaled in the U-shaped bracket 86 suspended from the bearing bracket 87.

A bevel pinion 88 is fixed upon one end of the shaft 7 2 and meshes with the ring gear 17 upon the drum 38. Upon the other end of the shaft 72 is fixed a gear 89 which meshes with a pinion 90 upon the shaft 91.

This latter shaft is journaled in a bearing 92 upon the double bearing bracket 87 and at one end in a bearing 93 formed upon the side of the gear housing, while the other end is ournaled in a bearing 94 upon the depending bearing bracket 95. e

The brake drum 96 is iixed upon the hearing bracket 87, as by the bolts 97 and 98, and has mounted therein the two semi-circular brake shoes 99. Right and left screws 100 connect the upper and lower ends of the brake shoes, each screw having one end mounted in a threadedaperture 101, in one of the brake shoes, and in a threaded aperture 102 formed in a threaded thimble 103, which is adiustably mounted in a threaded aperture 104 in the other shoe.

An arm 105 is fixed upon each-right and left screw 100 and is connected by a pair of links 106 to a collar 107 uponthe sleeve 108 which is slidably mounted upon the reduced portion 109 of-the shaft 91.

This sleeve is provided with an annular groove 110 in which are located pins 111 carried by the lever 112 which is pivoted at its upper end to the block 113, located upon the under side of the plate 31, the lower end thereof being connected by a rod 114 with the rocker arm 115 upon theshaft 85. A disk 116 is fixed upon one end of the shaft 85 and provided with a peripheral notch 117 arranged to be engaged by the tooth 118 upon a lever 119 pivoted to the U-frame 86 as at 120 and provided at its free end with a weight 121'to normally hold the tooth 118 in engagement with the periphery of the disk.

A cable or cord 122 is connected to the lever 119 and extends to a convenient location above decks where it may be easily reached for oper" ation. A gear 123 is fixed upon the other end of the shaft 85 and meshes with a pinion 1241 upon the countershaft 1.25. p

The pulley 126 is mounted upon the countershaft the cable 127 being connected to said pulley and having its free end extended into the life boat,

As shown in Fig. 9, the pulley 1.26 is connected to the shaft 125 by means of a coil spring 128. This spring is located within a socket 129, in the interior of the pulley, one

end ofthe spring being connected to the pulley, as shown at 130, and the other end thereof to the countershaft 125 as shown "at 181.

The worm 69 is connectedto the shaft (it in the manner shown in Fig. 10. A disk 132 is fastened to the'gear housing 67 as by the screws 133 andprovided with the central opening 134 of greater diameter than the shaft 66. Inclined notches 135 are formed in this central opening and receive the rollers 186 which are normally held in frictional engagement with the shaft by the coil springs For the purpose of controllingthe brake tion, resting upon the supporting standards,

and locked in this position by means of the locking device 12--141517, the operation of lowering the boat is as follows:

The cable 127 is pulled, rocking the pulley 126, and through it the shaft 125. Through the pinion 12-1- and gear 123, the shaft 85. is

rocked and through the arm 84 and bell crank 79, link 7 8 and yoke 75, the clutch member 7 1 is disengaged from the clutch member 73,

' whereby the weight of the boat will cause the any time during the descent of the boat it I desirable to stop the same in transit, it is only necessary tov pull still more upon the cable 127. 12 1-. and 123 will furtherrock the shaft 85, and through the arm 1155, link 11%, lever 112, sleeve 108 links 106 and arms 105, the brake shoes 99 will be applied to the brake drum 9G, stopping the operation of the mechanism, V v

:tis of course understood that when. the clutch T-fl--'?3 is opened thedescent of the boat is caused by the weight ofthe boat pulling upon the cables 21, rotating the drum 38 and paying out the cables2 l. e

In raising; theboat, the pawl 118 being in engagement with the notch 11'? of the disk 116, it is necessary to pull upward upon the cable 122, permitting the spring 128 to turn the shaft 85 to throw in the clutch when the motor may be started to raise the boat.

For emergency use, in the event that the 1 10 is fixed upon the motor shaft and meshes with a pinion 1 11 upon the shaft 1 12, which is j ournaled in the bracket 1 13, V,

This shaft is provided with a squared portion 144, adapted to receive a suitable tool by means of which the shaft may be rotated by hand to operate the raising mechanism.

The operation of the device is as follows: lVith the life boat in the normal raised position, resting upon the standards 2, and locked thereon by the latches 12, it is only necessary to release the catches 12 and to pull upon the cable 127, to put the lowering mechanism into operation.

This pullupon the cable 127 turns the pulley 126, and through the same rocks the shaft 125. The pinion 12% upon this shaft, cooperating with the gear 1L3, rocks the shaft 85, and the arm 84: carried thereby operates the bell crank 79, which, through the link 78, and yoke 75, acts to disengage the clutch me iber 74, from the member 73.

The drum38 bein thus released, the weight of the boat, pulling upon the cables, 2 1, will rotate the drum, permitting the boat to doscend. Thebooms 7 will first swing out to the extent of their movement, as limited by the 'chalns 30, this position being shown in dot and dash lines in Fig. 2, after which the boat will descend substantially vertically until it reaches the water.

The speed of 'descent ol the boat will be controlled by the brake governor, automatically operated'by the arms 105 and vanes 188.

If it is desired to stop the boat in transit, during the lowering operation, it is only necessary to pull harder on the cable 12?. lhe shaft 85, through themechanism above described, will be further rocked, and through the arm 115, link 114, lever 112, sleeve 108, links 106 and arms 105 the brake shoes 99 wil be applied to the brake drum 96 stopping the mechanism and'holding the boat against further descentuntil the pull upon the cable 12? is released sutliciently to release the brake.

I claim:

1. Davits for a ships life boat including supports mounted upon the ships deck,aboom member pivotally mounted upon the deck adjacent to each support, a pulley upon the upper end ot' each support, a pulley upon the upper end of each boom member, a drum adj acent to the davits, a cable located over the pulley Off each boom member and support and having one end connected to the drui i, a life boat suspended iromthe tree ends of the cables, a brake mechanism operatively connected to the drum, means operated by the lowering of the lite boat for automatically controlling said brake, a motor for raising the boat, a clutch between the motor and the drum and means for holding the clutch in disengaged position to lower the boat.

2. Davits tor a ships lite boat including supports mounted upon the ships deck, a boom member pivotally mounted upon the deck ad acent to each support, a pulley upon the upper end of each support, a pulley upon the upper end of each boom member, a drum adj acent'to the davit-s, a cable located over the pulley of each boom member and support and having one end connected to the drum, a life boat suspended from the free ends of the cables, a brake mechanism operatively connected to the drum, means operated by the lowering of the lite boat for automatically controlling said brake, a motor for raising the boat, a clutch between the motor and the drum and means tor holdin the clutch in disengaged position to lower the boat and for manually controlling said brake from the lite boat.

Davits tor a shi'ps lite boat including supports mounted upon the ships deck, a

boom member pivotally mounted upon the deck adj acent to each support, a pulley upon the upper end of each support, a pulley upon the upper end of each boom member, a drum adjacentto the davits, a cable located over the pulley of each boom member and support and having one end connected to the drum, a life boat suspended from the "free ends of the cables, abrake mechanism operatively connected to the druni,means operated by'thc lowering of the life boat for automatically controlling said brake, a clutch tor normally preventing rotation 01" the drum and manually operated means for controlling said clutch.

1. Davits for aships lite boat including supports mounted upon the ships deck, a boom member pivotally mounted upon the deck adjacent to each support, a pulley upon the "upper end of each support, a pulley upon the upper end of each boom member, a drum adjacent to the davits, a cable located over the pulley of each boom member and support and having one end connected to the drum, a life boat suspended from the free ends of the cables, a brake mechanism operatively connected to the drum means operated by the lowering of the life boat for automatically controlling said brake, a clutch tor normally preventingrotation ot' the drum and manual ly operated means for controllingsaid clutch and said brake mechanism. a l

5; Davits for a ships lite boat including supports mounted upon the ships deckya boom member pivotally mounted upon the deck adjacent to each support, a pulley upon the upper end or each support, apulley upon the upper end of each boom member, a drum adjacent to the davits, a cable located over the pulley 01" each boom member and sup-port and boat a clutch between the motor and the and having oneend connected to the drum, a

drum, and means for holding the clutch in dislife boat suspended from the free ends of the engaged position to lower the boat. cables, a brake mechanism operatively con-,

6. Davits for a ships life boat including nected to the drum, means operated by the 15 5 supports mounted upon the ships deck, a lowering of the life boat for automatically boom member pivotally mounted upon the controlling said brake and means for holding deek adjacent to each support, a pulley upon the brake mechanism inoperative when the the upper end Of'GEtCl'l support, a pulley upon liie boat is being raised.

the upper end of each boom member, a drum In testimony that I claim the above, I have 20 10 adjacent to the davits, a cable located over the hereunto subscribed my name.

pulley of each boom member and support ARTHUR W. LYDA. 

